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I usually work with web-based applications like http://www.showdocument.com
I use it for sharing my designs and documents with partners and clients,
but i guess it can used for other purposes too. If you’re looking for a free solution you should check it out.
– Laura W.

I think one point I’d stress about Google Wave is that it is very much like email or IM – unless you have people to talk to with it, the tool itself isn’t very useful. On the other hand, it’s really an interesting take on where email, collaboration, real-time & asynchronous chat, and versioning can go. I’m anxious to get it out in the hands of more people, and see what we do with it.